/**
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.jpedal.org
 * (C) Copyright 1997-2008, IDRsolutions and Contributors.
 * Main Developer: Simon Barnett
 *
 * 	This file is part of JPedal
 *
 * Copyright (c) 2008, IDRsolutions
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the IDRsolutions nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY IDRsolutions ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL IDRsolutions BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Other JBIG2 image decoding implementations include
 * jbig2dec (http://jbig2dec.sourceforge.net/)
 * xpdf (http://www.foolabs.com/xpdf/)
 * 
 * The final draft JBIG2 specification can be found at http://www.jpeg.org/public/fcd14492.pdf
 * 
 * All three of the above resources were used in the writing of this software, with methodologies,
 * processes and inspiration taken from all three.
 *
 * ---------------
 * BinaryOperation.java
 * ---------------
 */
package org.jpedal.jbig2.util;

public class BinaryOperation {

	public static final int LEFT_SHIFT = 0;
	public static final int RIGHT_SHIFT = 1;

	public static final long LONGMASK = 0xffffffffl; // 1111 1111 1111 1111 1111 1111 1111 1111
	public static final int INTMASK = 0xff; // 1111 1111

	public final static int getInt32(final short[] number) {
		return (number[0] << 24) | (number[1] << 16) | (number[2] << 8) | number[3];
	}

	public final static int getInt16(final short[] number) {
		return (number[0] << 8) | number[1];
	}

	public final static long bit32ShiftL(long number, int shift) {
		// return (number << shift) & LONGMASK;
		return number << shift;
	}

	public final static long bit32ShiftR(long number, int shift) {
		// return (number >> shift) & LONGMASK;
		return number >> shift;
	}

	/*
	 * public final static long bit32Shift(long number, int shift, int direction) { if (direction == LEFT_SHIFT) number <<= shift; else number >>=
	 * shift; return (number & LONGMASK); }
	 */

	public final static int bit8Shift(int number, int shift, int direction) {
		if (direction == LEFT_SHIFT) number <<= shift;
		else number >>= shift;

		return (number & INTMASK);
	}

	public final static int getInt32(final byte[] number) {
		return (number[0] << 24) | (number[1] << 16) | (number[2] << 8) | number[3];
	}
}
